Abstract
To study the influence of the near-fault vertical earthquake, the beam-spring-damper-pier model is used to simulate the double-span continuous beam bridge. The transient wave function expansion method and the indirect mode function method are used to calculate the seismic response of the bridge. The theoretical solutions of the contact force and displacement response of the bridge under vertical earthquake excitation near-fault are derived. By using piers with three different heights, the influence of vertical separation on pier-bending failure is analyzed reasonably. The results show that under the near-fault earthquake action, the split has a certain influence on the pier failure. Moreover, the stiffness and damping of the bearing have an influence on the pier failure, and the change of the maximum pier height has different effects. Therefore, for bridges of different sizes, it is of great significance to select the appropriate stiffness and damping bearings to reduce pier failure.
Highlights
Research on bridge damage was mainly concentrated in the horizontal direction [3,4,5], but in recent years, considering the influence of vertical seismic action on the structure, many scholars at home and abroad have conducted a lot of research
Vertical seismic action will change the axial force of the pier, and the increased axial force may cause the pier to be damaged under compression [6,7,8,9]
In view of the possible bending and shear damage caused by the axial force on the pier, a large number of experiments have been conducted, and it is proposed that under the action of a vertical earthquake, the fluctuation of the axial force will have an impact on the pier’s shear performance [10,11,12,13]
Summary
Strong vertical seismic excitation may reduce the contact force of the bridge support [18], resulting in the friction weakening between the main girder and the bridge pier. In the 1989 Loma Prieta earthquake in the United States [20], the highway bridge collapsed due to the vertical earthquake, and its piers passed through the bridge deck and stood upright This type of damage may cause the main girder to be thrown up under the action of a strong vertical earthquake. When it falls again, it will have a huge collision force with the pier, causing the pier to penetrate the bridge deck. The influence of pier size on the bending failure of the pier bottom is studied
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